Electrical heating riser head heat-preserving deoxidizing covering agent

Abstract

The invention designs an electric heating riser insulation deoxidation covering agent which comprises the raw materials with the following weight percentage of 70-85 percent of solid sodium silicate, 5-20 percent of lime and 2-10 percent of fluorite. The materials are mixed and stirred uniformly, and the particle size is 3-10mm. The materials are added in the riser to be electrically heated to form slag. The acidity value of the slag is 2.5-3.3, and activity of acidic oxides is high. The deoxidization ability of the slag is strong. The content of FeO in steel can be effectively reduced. The liquid quality of steel in the riser is guaranteed. The feeding ability is improved. And the covering agent has the advantages of proper viscosity and good liquidity, can be rapidly and evenly covered on the surface of the steel liquid, reduces the secondary oxidation of the steel liquid in a mold during the electric heating process, absorbs harmful gases and collects non-metallic inclusions in the steel liquid. The electric heating riser insulation deoxidation covering agent is beneficial for the separation of the inclusions and the steel liquid. Therefore, the product quality is greatly improved.

Description

technical field [0001] The invention relates to a covering agent for heat preservation and deoxidation of electric heating risers during pouring in the metallurgical casting industry. Background technique [0002] The electric heating riser is a method used in the production process of steel castings to improve the feeding capacity, eliminate casting defects such as shrinkage cavities, and improve the yield of castings. This method uses the high temperature and heat energy generated by the arc to keep the molten steel in the riser of the casting in a liquid state for a certain period of time, so that the molten steel in the riser is finally solidified, so that the steel castings can obtain high-quality castings. Covering agent is required for secondary oxidation, and white slag or calcium carbide slag in the reduction period of electric arc furnace is generally used as covering agent. Its main components are: CaO: (55-65)% SiO 2 : (15-20)% Al 2 o 3 : (2-3)% CaF 2 : (5-10...

AI Technical Summary

Problems solved by technology

[0003] In addition, the viscosity of the existing covering agent is also very unstable after melting. If the viscosity is too high, it will affect the heat transfer of the slag and reduce the diffusion of FeO, FeS and other substances inside the slag layer. If the viscosity of the slag is too low, it cannot effectively prevent the molten steel from Absorption of gas is also not conducive to the separation of molten steel and slag, resulting in increased inclusions in the steel and affecting product quality